Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Patent
1986-06-20
1988-03-01
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Cutting edge self-renewable during operation
175340, 175393, E21B 1060
Patent
active
047279460
ABSTRACT:
A rotary drill bit, for drilling wells in subsurface earth formations, and designed for rotation in a given direction, comprises a bit body having an internal passageway for drilling fluid. The bit body has an operating end face and at least one opening through that face communicating with the passageway. Cutters on the bit body form at least one elongate cutting region extending generally radially along a substantial portion of the operating end face. The cutters have cutting surfaces facing in the forward direction and generally continuous cutting edges at the outer extremity of the cutting surfaces. An elongate fence is carried on the bit body, extending generally parallel to the cutting region and spaced from the cutting region in a leading direction. The fence is adapted to ride loosely over the earth formation in use and in the absence of a positive pressure differential across the fence rear to front, and to more tightly engage the earth formation in the presence of such positive pressure differential, tightness of engagement increasing with the pressure differential. The opening in the operating end face of the bit body is positioned to deliver drilling fluid from the passageway to the area between the cutting region and the fence.
REFERENCES:
patent: 3384191 (1968-05-01), Schumacher et al.
patent: 4105083 (1978-08-01), Allen
patent: 4200160 (1980-04-01), Newcomb
patent: 4363367 (1982-12-01), Dixon et al.
patent: 4505342 (1985-03-01), Barr et al.
patent: 4577706 (1986-03-01), Barr
patent: 4596296 (1986-06-01), Matthias
Barr John D.
Matthias Terry R.
Leppink James A.
Melius Terry Lee
NL Industries Inc.
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